Security readout for executives and security teams
Plain-English summary
CVE-2020-3579 is a cross-site scripting flaw in Cisco SD-WAN vManage's web management interface. An attacker would need to trick a user into opening a crafted link. If successful, attacker-controlled script could run in that user's browser session and potentially read browser-based sensitive information or alter interface interactions.
Executive priority
Treat this as a moderate-priority management-plane issue. It is not a wormable or no-click vulnerability, but compromise of an administrator browser session could affect SD-WAN operations. Prioritize confirmation of exposure and vendor-aligned remediation.
Technical view
Cisco describes improper validation of user-supplied input in the vManage web interface. The CVSS 3.0 score is 6.1, with network attack vector, low complexity, no privileges required, and required user interaction. The issue maps to CWE-79 and affects Cisco SD-WAN vManage, but the source bundle does not provide affected version ranges.
Likely exposure
Exposure is most relevant where Cisco SD-WAN vManage is deployed and administrators access its web interface. Risk increases if the management interface is reachable from broad networks or if users can be persuaded to follow untrusted links. The provided sources do not specify affected versions.
Exploitation context
The source bundle supports phishing-style exploitation requiring a crafted link and user interaction. It does not support active exploitation claims: the CVE is not listed as KEV, and no cited source in the bundle states exploitation in the wild.
Researcher notes
Key constraints are CVSS UI:R and Scope:C, with limited confidentiality and integrity impact and no availability impact. The affected version data is incomplete in the provided bundle, so validation should start with Cisco's advisory rather than assumptions.
Mitigation direction
- Review Cisco's advisory for affected and fixed release guidance.
- Apply vendor-recommended updates when confirmed for your vManage version.
- Restrict vManage interface access to trusted administrative paths where feasible.
- Warn administrators not to open untrusted vManage links.
- Monitor Cisco guidance for any revised remediation details.
Validation and detection
- Inventory all Cisco SD-WAN vManage deployments and exposed management interfaces.
- Compare deployed versions against Cisco's advisory; bundle lacks version ranges.
- Confirm administrative access paths are limited and logged.
- Review security telemetry for suspicious vManage link activity.
- Document whether the environment contains the affected product.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-3579 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.1MediumVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20201104 Cisco SD-WAN vManage Software Cross-Site Scripting VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.